To date, triggers have only been accessible on each object's setup page, leading to a lot of hunting for code within the Salesforce CRM application. Even in Eclipse, switching between the Class and Trigger folders for a given project can be a pain.
These pains can partially be alleviated by keeping all Apex code in one place--as Apex Classes.
Read more: http://www.x2od.com/?p=583&preview=true#ixzz0FncHsqPw&B

One of Salesforce CRM’s coolest features from a “bright shiny object” standpoint (i.e. something that aids productivity but also looks flashy) is the image formula field. Jamie Grenney first wrote about this a while ago, and his pdf and sample images from the Salesforce built-in library are available on the community site. Sometimes, however, we want something simple. Sometimes we want to create a formula field that displays a simple checkbox (or an empty box). This is currently not possible, but has been suggested as a Salesforce Idea. Until that is built into the platform, feel free to use these two images in an image formula field (storing them in the documents folder): Or download this zip file and put it into a static resource for use in a Visualforce page.